长野原町（日语：长野原町／ながのはらまち）是群马县西北部的一町。是吾妻郡西部的中心。

Naganohara(長野原町,Naganohara-machi) is a town located in Agatsuma District of western Gunma Prefecture in the northern Kantō region of Japan. As of February 2015, the town had an estimated population of 5,612 and a population density of 41.9 persons per km². Its total area was 133.85 km². The controversial Yanba Dam project is located within Naganohara.